A woman runs with her child to safety after another report of a possible tornado in Springfield. (AP Photo/Jessica Hill)

A woman runs with her child to safety after another report of a possible tornado in Springfield, Mass., Wednesday, June 1, 2011. An apparent tornado struck downtown Springfield, one of Massachusetts' largest cities, scattering debris, toppling trees, and frightening workers and residents. (AP Photo/Jessica Hill)

People seek cover after an announcement of another possible tornado in Springfield, Mass., Wednesday, June 1, 2011. An apparent tornado struck downtown Springfield, one of Massachusetts' largest cities, scattering debris, toppling trees, and frightening workers and residents. (AP Photo/Jessica Hill)